[2026] Shopify Custom Checkout Guide: What You Can & Can’t Do

Your checkout is the last step before a sale. A Shopify custom checkout lets you match your brand, add the right fields, and place offers that lift your average order value, all inside Shopify’s rules. This guide explains what you can change, what you can’t, which plan you need, and how to do it step by step. I’m Charlie, and I’m BOGOS’s Marketing Manager. I work with Shopify promotions and checkout offers every day, so I’ll keep this practical and honest, with no fluff.

TL;DR

You can customize your Shopify checkout, but you can’t rebuild it from scratch on the hosted plans. Basic branding, checkout settings, and express payments work on every plan. Deeper control, like custom fields, in-checkout upsells, and custom logic, needs Shopify Plus. Everything now runs through Checkout Extensibility, since the old checkout.liquid file is being retired.

1. Why customize your Shopify checkout?

A default checkout works, but it treats every shopper the same. Customizing it helps you in three clear ways: fewer abandoned carts, higher order values, and more trust. Let me show you the numbers behind each one.

#1 Lower cart abandonment and lift conversion

Most shoppers who reach checkout still leave. The average cart abandonment rate sits at about 70%, based on Baymard Institute’s review of 50 studies. That means 7 in 10 ready buyers walk away.

The good news is that much of this is fixable. Baymard found that better checkout design alone can lift conversion by up to 35% for large stores. A smoother checkout is one of the fastest ways to recover abandoned carts and improve your store’s conversion rate.

#2 Increase average order value

Checkout is your last chance to sell more. A shopper who is ready to pay is far more likely to add one more item than a first-time visitor.

This is where a customized checkout earns its keep. You can show an upsell, a cross-sell, or a free gift right when intent is highest. Small, relevant offers at this stage are one of the simplest ways to raise average order value.

#3 Build trust with consistent branding

Trust decides many sales at the final step. About 19% of shoppers abandon a checkout because they don’t trust the site with their card details, Baymard reports.

A branded checkout closes that gap. When a customer clicks from your colorful store to a plain, generic checkout, the visual jump creates doubt. Matching your logo, colors, and fonts tells the buyer they are in the right place.

2. How Shopify checkout customization works now (both plans)

Before we split by plan, you need to understand the one framework that powers all of it. This part applies whether you’re on Basic or Plus.

Checkout Extensibility replaced checkout.liquid

Shopify changed how checkout customization works. The old method used a code file called checkout.liquid, which only Shopify Plus stores could edit. The new method is called Checkout Extensibility, and it is app-based, upgrade-safe, and works with Shop Pay.

Checkout Extensibility is not Plus-only. Both standard and Plus stores use it, and Plus just unlocks an advanced layer on top. I’ll break down exactly what each plan can customize in the next section.

The switch comes with deadlines you should not ignore. Shopify Plus stores had to move off checkout.liquid in August 2024 and August 2025, so those dates have passed. Standard plans must upgrade their thank-you and order-status pages by August 2026. Automatic upgrades began in January 2026, and Shopify Scripts are being retired on June 30, 2026, replaced by Shopify Functions.

What happens to your tracking and pixels (both plans)

The migration also changed how tracking works. Shopify removed the old “Additional Scripts” box where many merchants pasted their analytics code.

The replacement is web pixels and custom pixels. You now add your Google Analytics, Meta, or TikTok tracking through pixels, which run in a safe, separate space. If you used Additional Scripts before, plan to rebuild that tracking with pixels so you don’t lose data.

The full-control route: headless

There is one way to get total control of your checkout: going headless. With a headless setup, you build your own storefront and connect it to Shopify through its APIs.

This route is powerful but heavy. It needs developers, ongoing maintenance, and a bigger budget. For most merchants, the hosted checkout with Checkout Extensibility gives enough control without the cost, so headless is best left to large brands with special needs.

3. What you can customize on Shopify checkout: standard vs Plus

Your plan decides how much you can change. The two lists below show what each plan can customize, so you know where you stand before you start.

What you can customize without Shopify Plus

On a standard plan (Basic, Grow, or Advanced), you can shape how the checkout looks and behaves at a high level. You can’t edit the inner checkout steps with custom blocks or fields. Here’s what you get:

• Your logo, brand colors, basic fonts, and background.
• Checkout settings, like guest checkout, tipping, and order notes.
• Express payments, including Shop Pay, Apple Pay, and Google Pay.
• Approved apps, mainly on the thank-you and order-status pages.

What you can customize on Shopify Plus

Shopify Plus gives you everything above, plus deep control of the information, shipping, and payment steps. This is the full custom checkout on Shopify Plus. Here’s what Plus adds:

• Custom fonts and deep layout control in the Checkout Editor.
• Custom fields on the checkout steps, like a gift message or delivery date.
• Pixel-level design with the Branding API.
• In-checkout upsells, cross-sells, and free gifts.
• Custom discount, shipping, and payment logic with Shopify Functions.
• Checkout A/B testing and B2B checkout rules.

The table below sums it up at a glance.

Source: Shopify Help Center. One note on apps: standard plans can add checkout apps mainly to the thank-you and order-status pages, while Plus can place them across every checkout step.

4. How to customize your checkout without Shopify Plus

You can do plenty without Shopify Plus. This part covers Basic, Grow, and Advanced plans. Here you can brand the checkout, set it up the way you want, add express payments, and run post-purchase offers.

#1 Brand your checkout in the checkout editor (no code)

Branding is the first thing to fix, and it takes no code. Here is the path:

• Step 1: From your Shopify admin, go to Settings, then Checkout.
• Step 2: In the Configurations section, click Customize.
• Step 3: Upload your logo and set its position and size.
• Step 4: Pick your brand colors for backgrounds, buttons, and text.
• Step 5: Choose a font that matches your store.
• Step 6: Add a background color or image if it fits your brand.
• Step 7: Click Save.

That’s it. This is the core of checkout page customization on a standard plan, and it removes the jarring gap between your store and your checkout.

#2 Configure your checkout settings

Your settings decide how smooth the checkout feels. In the same Checkout settings page, you control the rules that shape the buyer’s path.

You can let people buy without an account, which is a big one. Forced account creation is a top reason shoppers quit, so offering guest checkout keeps first-time buyers moving. You can also turn tipping on or off, allow order notes, and set how customer accounts work.

#3 Turn on express checkout

Express payment buttons are the easiest conversion win you have. They let returning shoppers pay in one tap, with no forms to fill.

Turn on Shop Pay, Apple Pay, and Google Pay in your payment settings. Shopify’s own data shows Shop Pay can lift conversion by up to 50% compared to guest checkout, and it checks out about 4 times faster. Pairing express payments with a one-page checkout cuts friction even further.

#4 Add approved checkout apps

Apps extend your checkout without code. On a standard plan, most of your app power lives on the thank-you and order-status pages, which shoppers see right after they pay.

There you can add post-purchase upsells, review requests, and referral links. For example, a quick “15% off your next order” offer on the thank-you page brings buyers back with no ad spend. Our app, BOGOS, lets you run upsell offers that nudge shoppers toward a bigger order directly on the thank-you page.

When it’s time to upgrade to Plus

A standard plan covers most stores, but some needs point straight to Plus. Consider upgrading when you need to:

• Add custom fields to the checkout steps, like a gift message or delivery date.
• Show upsells directly inside the checkout, not just after purchase.
• Build custom discount, shipping, or payment rules.
• Run B2B checkout with company pricing and payment terms.
• A/B test different checkout versions against each other.

5. How to customize your checkout on Shopify Plus

Shopify Plus opens the full toolbox. You get everything standard plans have, plus deep control of the information, shipping, and payment steps. Plus removes the walls around the inner checkout, so you can add blocks, collect extra information, place offers, and change the logic behind discounts and shipping. The rest of this part walks through each option.

#1 Advanced branding with the Checkout Editor and Branding API

Plus gives you two levels of branding. The first is the visual Checkout Editor, where you drag and drop blocks and styles onto the checkout with no code.

The second is the Branding API, which gives pixel-level control. With it, you can set a favicon, control the exact corner radius on buttons, and fine-tune every color and font. This level needs a developer, but it lets your checkout match your design system exactly.

#2 Add custom fields and content to checkout

Sometimes you need more than a name and address. Shopify Plus lets you add custom fields and content blocks right on the checkout steps.

Think about a florist who needs a delivery-date picker, or a gift shop that wants a message box. A B2B store can add a purchase-order field. You can also drop in a banner, like a note that you don’t ship to PO boxes. These small touches make the checkout feel built for your buyer.

#3 Add in-checkout upsells and AOV boosters

This is the highest-value part of a Plus checkout. You can show offers inside the checkout, at the exact moment a shopper is ready to pay.

The main moves here are a checkout upsell, a cross-sell, a free gift, and a progress bar toward a reward. A skincare brand can offer a travel-size as an upsell. A supplement store can suggest a matching product as a cross-sell. A free gift at a spend threshold pushes carts higher, and a progress bar shows shoppers how close they are to earning it. These offers are a direct lever on average order value.

This is also where our app earns its place. With BOGOS, you can add gifts, bundles, and upsells to the checkout, though the in-checkout upsell feature requires Shopify Plus.

#4 Add custom logic with Shopify Functions

Functions let you change how checkout behaves, not just how it looks. They run server-side and replaced the old Shopify Scripts.

With Functions, you can build custom discount rules, hide or rename shipping options, and control payment methods. For example, you can hide cash on delivery for international orders, or apply a loyalty discount once a cart passes a set total. Apps built on Functions install on any plan, but building your own custom Functions is a Plus feature.

#5 A/B test your checkout

Plus lets you prove what works before you commit. You can create more than one checkout version and split your traffic between them.

This means you can test a new layout, a different upsell, or a fresh trust message against your current setup. Watch the checkout completion rate and average order value to pick the winner. Testing turns guesses into decisions.

#6 B2B and market-specific checkout rules

Plus also serves business and global sellers. You can set rules that fit wholesale buyers and different markets.

For B2B, you can show company-specific pricing, manage tax fields, and offer payment terms. For global stores, you can adjust payment methods and shipping by location. This makes the checkout feel purpose-built instead of generic.

6. Checkout customization mistakes to avoid

A custom checkout helps only when you keep it clean. I see the same mistakes hurt stores again and again. Avoid these:

• Over-cluttering the page. Too many banners and badges bury the “Place order” button.
• Adding too many form fields. The average checkout already shows about 23 form elements; more fields mean more drop-off.
• Branding that clashes with your store. A checkout that looks like a different brand breaks trust.
• Ignoring mobile. Most traffic is mobile, so test every change on a phone.
• Adding offers without testing. An untested upsell can slow checkout and cost sales.
• Skipping the migration. If you haven’t moved your thank-you and order-status pages off checkout.liquid, do it before the deadline.

7. How to know if your changes are working

Customization is only worth it if the numbers move. Don’t rely on a gut feeling.

Track two metrics above all: checkout completion rate and average order value. Completion rate tells you if friction went down, and order value tells you if your offers worked. On Plus, use built-in A/B testing to compare versions; on any plan, watch your conversion rate before and after each change. If a change doesn’t help your checkout numbers, roll it back.

Conclusion

A Shopify custom checkout is one of the highest-value projects you can take on, because it sits at the exact point where sales are won or lost. Start with what your plan allows. On a standard plan, brand the checkout, fix your settings, and turn on express payments. On Shopify Plus, go further with custom fields, in-checkout upsells, and custom logic.

Whatever your plan, focus on changes that cut friction and lift order value, and migrate off checkout.liquid before the deadline. Do that, and your checkout becomes a quiet engine for more Shopify sales. When you’re ready to add gifts, bundles, and upsells to that checkout, our app is built to help.

FAQs